I suspect things are different for every one of us. I'm in two covers bands, recently recruited to an originals band and currently looking at songs to help out another covers band... fortunately many of those do fall into the 3 or 4 chord bag - but not all! After performing my favourite bit is learning songs. If only I didn't keep getting distracted by songs I dont have to perform... 😁
As for tablets... it's really down to how people use them. There's no excuse not to learn straightforward stuff, but I've been known to look over someone's shoulder when jamming a song I haven’t played before.
The main issue is with vocalists... some use it as a crutch and lose their connection with the audience, others just use it as a safety net.